*{margin:0px;padding:0px;font-family: '微软雅黑';color:#272727;}
label{margin-right:10px;}
input{border:1px solid #0280BD;border-radius: 4px;height: 30px;padding-left:5px;width:200px;}
input:hover{border:1px solid #093B73;}
button{background: #0280BD;color:white;border:1px solid #0280BD;cursor: pointer;border-radius: 4px;height:30px;padding:1px 7px;}
button:hover{background:white;color:#272727;}
.lenth_300{width:300px;}
.fl{float:left;}
.fr{float:right;}
.clear:after{  content:""; display:block; clear:both;}  
.clear{*zoom:1;}
.demo_div{width:300px;margin:250px auto;font-size:20px;color:#DA3F8C;font-weight: 800;}